feat(pkg): 更新包管理系统并升级至LeonOS 0.3.6

- 将包安装目录从/leonos/packages迁移至/packages
- 更新版本号至0.3.6
- 修改installer.lua以正确处理packages目录
- 更新pkg.lua程序适配新的包路径
- 添加示例包文件到新位置

data/computercraft/lua/packages/example-pkg/1.0.0/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "example",
+  "version": "1.0.1",
+  "description": "An example package for LeonOS",
+  "author": "LeonMMcoset",
+  "license": "MIT",
+  "dependencies": {},
+  "files": [
+    "programs/example.lua",
+    "completions/example.lua"
+  ]
+}